Factors influencing nonstress test results in multiple gestations.

The nonstress test remains the most widely used method of antepartum fetal health assessment in multiple gestations. However, few data are available on factors influencing its results in those cases. Our observation on 530 such tests has shown results similar to those in singleton gestations. Prematurity was associated with a higher rate of nonreactive tests; however, order and mode of presentation had no impact.